Automatic cut-off for steam-engines



(No Model.)

J. H. WHEAT. AUTOMATIC GUT-OFF FOR STEAM ENGINES. No. 439,709. Patented Nov. 4, 1890.

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65%; 0%! rwzz UNITED STATES PATENT OFFICE.

JAMES H. WHEAT, or DAYTON, OHIO.

AUTOMATIC CUT-OFF FOR STEAM-ENGINES.

SPECIFICATION forming part of Letters Patent No. 439,709, dated November 4, 1890.

Application filed January 11, 1890. Serial No. 836,716. (No model.)

To all whom it may concern.-

Be it known that I, JAMES H. WHEAT, a citizen of the United States, residing at Dayton, in the county of Montgomery and State of Ohio, have invented a new and useful Automatic Cut-Off for Steam-Engines, of which the following is a specification.

My invention relates to improvements in an automatic cut-off for steam-engines; and it consists of the peculiar construction and combination of parts, hereinafter fully described, and specifically pointed out in the claims.

The objects of my improvement are, first, to get the full or nearly full boiler-pressure of steam in the cylinder at .the beginning of each stroke of the piston; second, to close the admission of steam to the cylinder at the earliest possible moment; third, to obtain the largest amount of power from the expansion of steam, in order that the economy of fuel to be derived thereby may be as nearly perfect as practicable with a steam-engine of plain and simple construction, having all the movements of the different parts thereof sure and positive, which will enable an engine to make any number of revolutions possible with engines. I attain these objects by the mechanism illustrated in the accompanying drawing, in which the figure is a plan view of my device.

A is an adjustable plate; B, a frame to guide plate A and balance the steam-pressure on same; O,.a self-adjusting guide-block having slotted hole and flanges; D, a flat valve hav ing one flange and two lugs; E, a valve-rod; F, a weight to counterbalance the movable parts A, O, and D; G, a ball-governor; H, the stem part of plateA; I, a cylinder; J, port-holes for admission of steam to cylinder; K, a steampassage in frame B; L, a valve-chest with cover removed, and N a waste-cock.

The following is a detailed description of my improvements: The plate A is to control the movement of the valve D, so that it shall be in a line nearly parallel with the enginecylinder, and by its connection with the governor it is made to control the relative position of the valve D with the port-holes, which admits steam to the engine-cylinder, thus regulating the amount of steam passing through said port-holes at each revolution of the engine. The frame B is to control the movement of the plate A by means of its stem or stems, so that its movement shall be in line nearly at right angles with the center line of the cylinder. The object of steam-passage K in frame B is to allow the steam-pressure to be exhausted on the other end of stem H, so as to balance it. The steam-passage K in frame B is to cause the steam-pressure on plate A and its stem H to be equal-in all directions, so that when plate'A and valve D are counterbalanced with weight F at any given amountof steam pressure it shall remain equally-well balanced at all other pressures or no pressure at all, as the case maybe. The guide-block C is to provide a means by which the valve-rod E will control the movement of the valve D in the direction corresponding with the center line of the valve-rod Without in the least interfering with every movement of said valve, which is to be controlled by the governor; also, to allow the valve to adjust itself to its seat in the valve-chest by the steam-pressure. In case of gritty substance carried from the boiler or other sources causing excessive wear upon the valve-seat, the valve can follow up in that direction without bending or cramming the valve-rod or interfering with any other movements that may be required. The position and relation of the valve-chest are desirable, as they give easy access to the valves,.so that they may be removed, examined, and replaced again without changing any of the parts that connect it with the governor.

Having thus described my invention, what I claim is 1. In an automatic cut-off, the combination, with the governor, of the adjustable guideplate A, connected to the governor, having its stem or stems fitted to a frame or frames B, which admits steam to the other end of stem or stems, and a slotted flanged self-adjusting guide-block O, loosely connected to both the valve D and valve-rod E, substantially as described.

2, In an antomaticent-off, the combination, block C, loosely connected to both the valve with the governor, of the adjustable gnide- D and Valve-rod E, substantially as set forth.

plate A, connected to the governor and connt 1 7 Y 7 V n terhalanced by a weight F, having its stem or JAMES VV HEA] 5 stems fitted to a frame or frames B, which ad- Attest:

lnits steam to the other end of stem 01* stems, II. 0. SOUTH,

and a slotted flanged self-adjusting gnide- FRANK B. FORTIER. 

